Attachment for door-clamps.



Patented May 9, 1911.

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l/Vl/ENTOR flei'erzc ZZfZa/we man/ms F. W. LANE.

ATTACHMENT FOR DOOR CLAMPS.

APPLICATION rum) AUG. 20. 1910.

F. W. LANE.

ATTACHMENT FOR DOOR CLAMPS.

APPLICATION mum AUG. 20. 1910.

Patented May 9, 1911.

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INVENTOR 1mmIEEEMEEE WITNESSES- ATTORNEYS 4:11., WA$NINuNN, o. C 1

UNITED STATES PATENT OFFICE.

FREDERICK WALTER LANE, 0F CHICO, CALIFORNIA.

ATTACHMENT FOR DOOR-CLAMPS.

To all whom it may concern:

Be it known that I, FREDERICK WV. LANE, a citizen of the United States,and a resident of Chico, in the county of Butte and State of California,have invented a new and Improved Attachment for Door- Clamps, of whichthe following is a full, clear, and exact description.

The invention is an attachment for clamps as used in .the manufacture ofdoors, sash, blinds, etc., in clamping the various parts together, asthe stiles and rails, and has for its purpose to prevent appreciablefriction between one of the jaws of the clamp and the door or similarpiece of mill work, so that the stiles and rails will be brought atexactly right-angles to each other when the door is fully pressedtogether. To this end the attachment comprises a bearing-bar constructedto bear fiat against one of, the jaws of the clamp, and having endlessraceways containing rollers, and a presser-bar bearing on the rollers,

. with one of the bars having a projection and the other bar havingspring-pressed members normally bearing against the opposite sides ofthe projection, and operating to return the presser-bar to centralposition when the latter is released by the door or other objectclamped.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a perspective view of a door clamp having my improvedattachment applied to one of the jaws; Fig. 2 is a plan of thebearing-bar; Fig. 3 is an inner face view of the same; Fig. 4 is a planof the presserbar; Fig. 5 is an inner face View of the same; Fig. 6 is across-section through the attachment as applied to one of the jaws ofthe clamp; Fig. 7 is a fragmentary horizontal section through theattachment; and Fig. 8 is a fragmentary plan of the same, partly inhorizontal section. V

For the purpose of illustrating the application and nature of myimproved attachment, I have shown a conventional form of door clampembodying relatively long and parallel clamping jaws 10, 10, adjustableto and from each other. The attachment comprises a bearing bar 11,ordinarily of the length of one of the jaws of the clamp, and apresser-bar 12, the clamping-bar, as shown Specification of LettersPatent.

Application filed August 20, 1910.

Patented May 9, 1911.

Serial No. 578,107.

in Figs. 3, G and 7, being in the nature of a channel bar, with the openside arranged adjacent to the resser-bar and divided into a number ofroller compartments by spacing blocks 13, which are arranged toapproximately distribute the compartments uniformly throughout thelength of the bar, each roller compartment having a vertical partitionor bearing plate 14, terminating at each end ,short of the blocks 13,and forming in connection therewith an endless roller raceway, in whichare arranged vertical rollers 15, the inner length of rollers protrudingfrom the inner face of the bearing-bar 11 and presenting a bearingsurface for the presser-bar. The presser-bar 12 has alongitudinally-extending' angle-iron 16, attached to its upper edge,with the outer flange of the angle-iron depending over the top of thebearing-bar 11 and forming in connection with the presser-bar aninverted channel, in which are journaled a number of rollers 17, bearingon the top of the bearing-bar 11 and supporting the lower edge of thepresser-bar above the bottom of the bearing-bar, the roller bearings 15and 17 operating to permit of the presserbar moving freelylongitudinally of the bearing-bar, even when the presser-bar issubjected to lateral pressure. To the upper face of the bearing-bar 11,and preferably at the center, is attached a rojection or ear 18,arranged to overhang t 1e top or angleiron of the resser-bar 12 and beengaged at opposite sides by plungers 19, slidable in barrels or sockets20, attached to the top of the presser-bar, the outer ortion of eachplunger within its socket being of reduced diameter to receive a helicalspring 21, normally forcing the plunger inwardly against the ear 18, theinward movement of the plunger being limited by lock nuts or otherenlargements 22, secured to the outer end thereof at the outside of thebarrel.

The attachment is applied to the clamp as shown in Fig. 6, wherein itwill be seen that the outer closed face of the bearing-bar bears flatagainst the inner face of one of the clamping-jaws, the presser-barbeingretained centrally of the bearing-bar by the engagement of the springplungers 19 with the ear 18. WVith the attachment in this position, thedoor, sash or similar piece of mill work is laid flat in the clamp, withthe stiles extending lengthwise of the clampingjaws. When the jaws areforced together,

if the shoulders presented by the mortise andtenons of the rails andstiles do not strike exactly flat, the presser-bar moves in a directionalong the length of the bearingbar to bring the joints of the door,etc., fiat together, thus securing the stiles and rails at exactlyright-angles to each other. When the clampingj aws are released, theplungers again return the presser-bar to central position in readinessto receive the next piece of work. When it is desired to use the clampin the ordinary manner, the attachment is removed by simply lifting itfrom the clamping jaw.

Having thus described my invention I claim as new and desire to secureby Letters Patent:

1. In an attachment for doors and like clamps, a bearing-bar constructedto be sustained by one of the jaws of the clamp, a presser-bar freelymovable on the bearingbar, a projection carried by one of said bars, andspring-pressed members carried by the other of said bars and bearingagainst the opposite sides of the said projection.

2. In an attachment for doors and like clamps, a bearing-bar constructedto be sustained by one of the jaws of the clamps, a presser-bar, rollerbearings arranged between the two bars', adapting the presser-bar tomove freely longitudinally of the bearing-bar, and means toautomatically return the presser bar to initial position when it isdisplaced.

3. In an attachment for door and like clamps, a bearing bar, a memberprojecting from said bar, a presser bar movable relatively to saidbearing bar, and means acting on said member whereby the presser bar ismaintained centrally of the bearing bar.

at. In an attachment for door and like clamps, a bearing bar, an earprojecting from said bar, a presser bar movable relatively to saidbearing bar, and spring controlled plungers pressing on opposite sidesof said ear, whereby the presser bar is maintained centrally of thebearing bar.

5. In an attachment for door and like clamps, a bearing bar, a presserbar movable relatively to said bearing bar, an angle-iron projectingfrom said presser bar and overlying said bearing bar, and rollerbearings journaled in the said angle-iron and presser bar, whereby thepresser bar is movable relatively to said bearing bar.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERICK WALTER LANE.

l/Vitnessesz J. J. BAKER,

H. B. BOUNDS.

Copies of this patent may be obtained for five cents each, by adgiressing the Commissioner of Patents,

Washington, I). G. a

